Process of making tubular rollers



(No Model.)

QILMENEELY. PROCESS OF MAKING TUBULAR ROLLERS.

N0. 473,943. Patslgted May 3, 1892.

MUTNESSES I JNVENTOl BF /m 1 rmm.

ArTazgm:

UN TED STATES PATENT OFFICE.

CHARLES DICKINSON MENEELY, OF

ALBANY, NElV YORK.

PROCESS OF MAKING TUBULAR ROLLERS.

SPECIFICATION forming part of Letters Patent No. 473,943, dated May 3,1892.

Application filed November 10, 1891. Serial No. 411,471.

To mil whom it may concern.-

Be it known that I, CHARLES DICKINSON MENEELY, a CllllZtJl of the UnitedStates, residing in the city and county of Albanyfitate of New York,have invented a new and useful Process of Constructing Tubular Rollers,of which the followingis a specification.

My invention relates to metal tubular rollers and processes ofmanufacturing the same; and the object of my invention is to provide aprocess of making a tubular roller from a bar of steel or other suitablemetal in such a manner that the fiber of the metal shall extend aroundthe tube circumferenlially instead of extending along the tubelongitudinally, as is common in the nuuiufacture of tubes. 1 attain thisobject, by means of the process hereinafter described, and illustratedby the accompanying drawings, in whieh- Figure 1 represents a bar ofsteel, a crosssection of which is trapezoidal in form. Fig. 2 is across-section of Fig. 1. Fig. 3 is a longitudinai section of a tubularroller before the spiral portions are welded, and l-ig. l is alongitudinal section of a tubular roller after the welding process.

Siinilarlettersrefertosimilar out the several views.

For the purpose of constructing a tubular roller which shall be able tosuccessfully withstand excessive pressure placed upon it withoutchanging even in a slight degree its circumferential contour I haveinvented a process of making a tube out of a bar of steel A in which thefiber of the steel shall he drawn around the tube spirally, as shown inFig. 3, and then welded together by subjecting the tube to heat andapplying force to the ends. To accomplish this result I take a piece ofmetal, usually steel, a cross-sect ion of which is in the form. of atrapezoid, (shown in Fig. 2,) place it in contact with a mandrel, havingthe narrower side i; of the two faces of the bar A next to thcmandrel,and coil the bar spirally about; the mandrel, which will cause a tube tobe formed about the mandrel in the form of a coil having the samediameter througlnnit, with the ct 'iguous fat s of the spirals (1 atright angles parts lhrouglr the axis oi the tube and in close contactwith each other tln'oughouttheir (No model.)

whole extent. The angles of the trapezoidal bar may be changed in such ainanner as to correspond with the changes made in the sire of the rollerto be formed, it being necessary to form the bar in such a shape that itwill assume the form of a tube about the mandrel, having its spiralscoinciding and in close contact with each other throughout the whole eX-tent of their lateral'faces. 'lheusei result; effected by making the bartrape; lid in form is that when the bar is coiled a: ntthe mandrel, theouter face of the bar, it... no a greater distance to traverse in makingthe circuit, must be wider than the face thatis next to the mandrel,otherwise the contiguous faces of the spirals will not come in contactwith each other throughout their whole extent, the result which iwlsh'to obtain. it is apparent that the fiber of the metal will followthe direction of the barabouttho mandrel, thus extending around the tubein a spiral direction, affording the very greatest resistance to forceor pressure which maybe brought in contact with it in the directionofits diameter. T

For the purpose of uniting the several spirals (i of the tube togetherin one homogeneous' body I apply heat and end pressure to the tube andthus force the ends toward each other, welding the contiguous faces oftho spirals the spiral sections all uniting, making a perfectly uniformtubular rollci'.

An important; part of my invention is the construction of my tube withits spirals joinlug each other throughout their whole extent in a lineperpendicular to. the axis of the roller in such a manner that'whcnpressure is applied at the end of the tube it shall act directly uponall portions of the contiguous surfaces of the spirals, in this respectdift'ering nmteria-lly from those tubes which have anoverlappiugconncclion ofthespirals,iuwhich it is impossible to obtain asatisfactorgwelding by end pressure.

i employ tubular rollers manufactured by the process hereindes(':ribed.in roller-bearings used upon rail\vaycars, where theyobliged to sustain extremely heavy we and are subjected to the mostsevere st: occasioned by jolting, sudden, violent, andirconsiderablemoidnLshaped hm 200:5 coincidweld- 25 ,subst:u1--

E ELY.

